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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Ben Gardon <bgardon@google.com>,
	Junaid Shahid <junaids@google.com>,
	Liran Alon <liran.alon@oracle.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	John Haxby <john.haxby@oracle.com>,
	Miaohe Lin <linmiaohe@huawei.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [PATCH v3 02/37] KVM: nVMX: Validate the EPTP when emulating INVEPT(EXTENT_CONTEXT)
Date: Mon, 23 Mar 2020 08:45:55 -0700	[thread overview]
Message-ID: <20200323154555.GH28711@linux.intel.com> (raw)
In-Reply-To: <871rpj9lay.fsf@vitty.brq.redhat.com>

On Mon, Mar 23, 2020 at 03:51:17PM +0100, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@intel.com> writes:
> 
> > Signal VM-Fail for the single-context variant of INVEPT if the specified
> > EPTP is invalid.  Per the INEVPT pseudocode in Intel's SDM, it's subject
> > to the standard EPT checks:
> >
> >   If VM entry with the "enable EPT" VM execution control set to 1 would
> >   fail due to the EPTP value then VMfail(Invalid operand to INVEPT/INVVPID);
> >
> > Fixes: bfd0a56b90005 ("nEPT: Nested INVEPT")
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > ---
> >  arch/x86/kvm/vmx/nested.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > index 8578513907d7..f3774cef4fd4 100644
> > --- a/arch/x86/kvm/vmx/nested.c
> > +++ b/arch/x86/kvm/vmx/nested.c
> > @@ -5156,8 +5156,12 @@ static int handle_invept(struct kvm_vcpu *vcpu)
> >  	}
> >  
> >  	switch (type) {
> > -	case VMX_EPT_EXTENT_GLOBAL:
> >  	case VMX_EPT_EXTENT_CONTEXT:
> > +		if (!nested_vmx_check_eptp(vcpu, operand.eptp))
> > +			return nested_vmx_failValid(vcpu,
> > +				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
> 
> I was going to ask "and we don't seem to check that current nested VMPTR
> is valid, how can we know that nested_vmx_failValid() is the right
> VMfail() to use" but then I checked our nested_vmx_failValid() and there
> is a fallback there:
> 
> 	if (vmx->nested.current_vmptr == -1ull && !vmx->nested.hv_evmcs)
> 		return nested_vmx_failInvalid(vcpu);
> 
> so this is a non-issue. My question, however, transforms into "would it
> make sense to introduce nested_vmx_fail() implementing the logic from
> SDM:
> 
> VMfail(ErrorNumber):
> 	IF VMCS pointer is valid
> 		THEN VMfailValid(ErrorNumber);
> 	ELSE VMfailInvalid;
> 	FI;
> 

Hmm, I wouldn't be opposed to such a wrapper.  It would pair with
nested_vmx_succeed().

> 
> > +		fallthrough;
> > +	case VMX_EPT_EXTENT_GLOBAL:
> >  	/*
> >  	 * TODO: Sync the necessary shadow EPT roots here, rather than
> >  	 * at the next emulated VM-entry.
> 
> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> 
> -- 
> Vitaly
> 

  reply	other threads:[~2020-03-23 15:45 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20 21:27 [PATCH v3 00/37] KVM: x86: TLB flushing fixes and enhancements Sean Christopherson
2020-03-20 21:27 ` [PATCH v3 01/37] KVM: VMX: Flush all EPTP/VPID contexts on remote TLB flush Sean Christopherson
2021-08-03  1:45   ` Lai Jiangshan
2021-08-03 15:39     ` Sean Christopherson
2021-08-04  3:11       ` Lai Jiangshan
2021-08-04 15:33         ` Sean Christopherson
2020-03-20 21:27 ` [PATCH v3 02/37] KVM: nVMX: Validate the EPTP when emulating INVEPT(EXTENT_CONTEXT) Sean Christopherson
2020-03-23 14:51   ` Vitaly Kuznetsov
2020-03-23 15:45     ` Sean Christopherson [this message]
2020-03-23 23:46       ` Paolo Bonzini
2020-03-20 21:27 ` [PATCH v3 03/37] KVM: nVMX: Invalidate all EPTP contexts when emulating INVEPT for L1 Sean Christopherson
2020-03-23 15:24   ` Vitaly Kuznetsov
2020-03-23 15:53     ` Sean Christopherson
2020-03-23 16:24   ` Jim Mattson
2020-03-23 16:28     ` Sean Christopherson
2020-03-23 16:36       ` Jim Mattson
2020-03-23 16:44         ` Sean Christopherson
2020-03-23 23:50           ` Paolo Bonzini
2020-03-24  0:12             ` Jim Mattson
2020-03-30 18:38               ` Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 04/37] KVM: nVMX: Invalidate all roots when emulating INVVPID without EPT Sean Christopherson
2020-03-23 15:34   ` Vitaly Kuznetsov
2020-03-23 16:04     ` Sean Christopherson
2020-03-23 16:33       ` Vitaly Kuznetsov
2020-03-23 16:50         ` Sean Christopherson
2020-03-23 16:57           ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 05/37] KVM: x86: Export kvm_propagate_fault() (as kvm_inject_emulated_page_fault) Sean Christopherson
2020-03-23 15:47   ` Vitaly Kuznetsov
2020-03-23 16:24     ` Sean Christopherson
2020-03-23 23:56       ` Paolo Bonzini
2020-03-20 21:28 ` [PATCH v3 06/37] KVM: x86: Consolidate logic for injecting page faults to L1 Sean Christopherson
2020-03-24  0:47   ` Paolo Bonzini
2020-03-20 21:28 ` [PATCH v3 07/37] KVM: x86: Sync SPTEs when injecting page/EPT fault into L1 Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 08/37] KVM: VMX: Skip global INVVPID fallback if vpid==0 in vpid_sync_context() Sean Christopherson
2020-03-25  9:33   ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 09/37] KVM: VMX: Use vpid_sync_context() directly when possible Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 10/37] KVM: VMX: Move vpid_sync_vcpu_addr() down a few lines Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 11/37] KVM: VMX: Handle INVVPID fallback logic in vpid_sync_vcpu_addr() Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 12/37] KVM: VMX: Drop redundant capability checks in low level INVVPID helpers Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 13/37] KVM: nVMX: Use vpid_sync_vcpu_addr() to emulate INVVPID with address Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 14/37] KVM: x86: Move "flush guest's TLB" logic to separate kvm_x86_ops hook Sean Christopherson
2020-03-25 10:23   ` Vitaly Kuznetsov
2020-03-25 15:41     ` Paolo Bonzini
2020-03-25 16:08       ` Vitaly Kuznetsov
2020-03-25 15:48     ` Sean Christopherson
2020-03-25 16:11       ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 15/37] KVM: VMX: Clean up vmx_flush_tlb_gva() Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 16/37] KVM: x86: Drop @invalidate_gpa param from kvm_x86_ops' tlb_flush() Sean Christopherson
2020-03-25 11:23   ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 17/37] KVM: SVM: Wire up ->tlb_flush_guest() directly to svm_flush_tlb() Sean Christopherson
2020-03-25 11:23   ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 18/37] KVM: VMX: Move vmx_flush_tlb() to vmx.c Sean Christopherson
2020-03-25 11:25   ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 19/37] KVM: nVMX: Move nested_get_vpid02() to vmx/nested.h Sean Christopherson
2020-03-25 11:25   ` Vitaly Kuznetsov
2020-03-20 21:28 ` [PATCH v3 20/37] KVM: VMX: Introduce vmx_flush_tlb_current() Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 21/37] KVM: SVM: Document the ASID logic in svm_flush_tlb() Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 22/37] KVM: x86: Rename ->tlb_flush() to ->tlb_flush_all() Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 23/37] KVM: nVMX: Add helper to handle TLB flushes on nested VM-Enter/VM-Exit Sean Christopherson
2021-10-28 13:11   ` Lai Jiangshan
2021-10-28 15:22     ` Sean Christopherson
2021-10-29  0:44       ` Lai Jiangshan
2021-10-29 17:10         ` Sean Christopherson
2021-10-30  1:34           ` Lai Jiangshan
2021-11-04 17:47             ` Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 24/37] KVM: x86: Introduce KVM_REQ_TLB_FLUSH_CURRENT to flush current ASID Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 25/37] KVM: x86/mmu: Use KVM_REQ_TLB_FLUSH_CURRENT for MMU specific flushes Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 26/37] KVM: nVMX: Selectively use TLB_FLUSH_CURRENT for nested VM-Enter/VM-Exit Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 27/37] KVM: nVMX: Reload APIC access page on nested VM-Exit only if necessary Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 28/37] KVM: VMX: Retrieve APIC access page HPA only when necessary Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 29/37] KVM: VMX: Don't reload APIC access page if its control is disabled Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 30/37] KVM: x86/mmu: Move fast_cr3_switch() side effects to __kvm_mmu_new_cr3() Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 31/37] KVM: x86/mmu: Add separate override for MMU sync during fast CR3 switch Sean Christopherson
2020-03-24 11:07   ` Paolo Bonzini
2020-03-20 21:28 ` [PATCH v3 32/37] KVM: x86/mmu: Add module param to force TLB flush on root reuse Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 33/37] KVM: nVMX: Skip MMU sync on nested VMX transition when possible Sean Christopherson
2020-03-24 11:19   ` Paolo Bonzini
2020-03-20 21:28 ` [PATCH v3 34/37] KVM: nVMX: Don't flush TLB on nested VMX transition Sean Christopherson
2020-03-24 11:20   ` Paolo Bonzini
2020-03-24 18:10     ` Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 35/37] KVM: nVMX: Free only the affected contexts when emulating INVEPT Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 36/37] KVM: x86: Replace "cr3" with "pgd" in "new cr3/pgd" related code Sean Christopherson
2020-03-20 21:28 ` [PATCH v3 37/37] KVM: VMX: Clean cr3/pgd handling in vmx_load_mmu_pgd() Sean Christopherson

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